Re: [boost] [multi_index]boost/boost/multi_index/detail/index_base.hpp:49:error

From: Joaquín Mª López Muñoz (joaquin_at_[hidden])
Date: 2006-03-06 13:13:50

Felipe Magno de Almeida ha escrito:

> Hi,
>
> I'm having a compiler error with gcc 3.4.4. It compiles cleanly with
> VC7.1 and gcc4.1.
> I'm using the CVS version of boost.
> The code is:
>
> header_decode_type and header_encode_type types dont really matter,
> are just member variables that are passed to header constructor.
>
> header headers::operator[](std::string const& name) const // line 57
> {
>   headers_multi_index_t::nth_index<1>::type const& index =
> headers_set_.get<1>();
>   return header(index.equal_range(name)
>     , header_decode_handler_, header_encode_handler_);
> }
>
> The headers_multi_index_t is:
>
> typedef std::pair<std::string, std::string> pair;
> typedef mi::multi_index_container<pair
>   , mi::indexed_by
>     <
>       mi::sequenced<>
>       , mi::ordered_non_unique
>         <
>           BOOST_MULTI_INDEX_MEMBER(pair, std::string, first)
>           , iless
>         >
>     >
>   > headers_multi_index_t;
>
> And the header constructor is:
>
> typedef std::pair<iterator, iterator> iterator_pair;

Here. What is this "iterator" type? What index.equal_range(name)
returns is a

  std::pair<
    headers_multi_index_t::nth_index<1>::type::iterator,
    headers_multi_index_t::nth_index<1>::type::iterator
  >

where the iterators are not the same type as
headers_multi_index_t::iterator; this is explained with more parsimony at

http://boost-consulting.com/boost/libs/multi_index/doc/tutorial/basics.html#iterator_access

Could this be related to the problem, or am I completely misguided?
If the latter, a complete testcase reproducing the problem would be of
much help.

Joaquín M López Muñoz
Telefónica, Investigación y Desarrollo